<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <ul>
        <li v-for="(item,index) in num" :key='index' >
            <p> {{item}} <button @click="del(index)">删除</button> </p>
        </li>
      </ul>
      <button @click="add">生成</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          num: [],
        },
        methods: {
          add() {
            this.num.push(Math.floor(Math.random() * 20))
          },
          del(index){
            this.num.splice(index,1)
          }
        },
      });
    </script>
  </body>
</html>
